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PCB Door Contact Connections

 
The Proxitrol Mux is available in 16 Channel (Door) increments, from 16 to 128 - making the maximum doors which can be monitored by a single mux 128 units.  Connecting the Mux to each door is accomplished by connecting a single wire from Channel x on the mux to one of the two wires on the door contact.  The second wire of the door contact becomes a Return for the door contact switch.  Any number of contact switches may be connected to a single return, however for debugging, it generally makes sense to limit this.  Normally 25 pair cable is used allowing up to 24 doors to be on one cable and a single Return wire, or 22 doors, utilizing two separate Return wires - one for each 11 doors.
 
In the case of a 128 Channel Mux, on the main board of the Proxitrol Mux there are 8 rows of 16 channels plus provision for 4 Returns.  These are contained in two 10 position pluggable connectors as shown in the the image below.    See subsequent sections of this subject for complete installation and wiring information.
 
Always plan the installiom to allow for extra channels on the multiplexer and extra conductors in the trunk line for service. These extra channels can be used when the drawings and *as-built* are not the same.  They can also be used to monitor man doors, emergency exits and other such areas you wish to monitor, but decided late in the game.
 
PCB Door Contact Connections
 
!Warning
A drain wire from the shield MUST be attached to the GND  Data Connector to protect the device from Lightning!  Only connect the drain wire to the remote end!  Power Section for more information.
1

Channels 1 to 10

 
2

Channels 11 to 16 PLUS 4 Return Points

2. Channels 11 to 16 PLUS 4 Return Points
3

Channels 29 to 32 PLUS 4 Return Points

 
4

Channels 45 to 48 PLUS 4 Return Points

 
5

Channels 61 to 64 PLUS 4 Return Points

 
6

Channels 77 to 80 PLUS 4 Return Points

 
7

Channels 93 to 96 PLUS 4 Return Points

 
8

Channels 109 to 112 PLUS 4 Return Points

 
9

Channels 125 to 128 PLUS 4 Return Points